[6.17] - Bard Visual Bug

http://i.imgur.com/MadI6Sy.png **Server:**EUW **Type of Bug:** Visual in-game bug **Details:** Recently I was playing bard and as soon as I got my ultimate I used it and it seemed to bug the upgrade icon. As you can see in the screenshot the upgrade icon is still there despite me being unable to upgrade the actual ability. This has only happened to me on 2 occasions that I can remember and in both situations I used my ult as soon as I upgraded it but it seems to be quite random as when trying to reproduce it in a custom game it didn't work.
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